Symbol: PSU
Crystallinity: Amorphous
Trade Names: Udel, Mindel, Ultrason S

Learn more about Polysulfone.


PSU Plug Fotolia_33438985_S.jpgPSU is a transparent, highly heat resistant and very stable engineering resin. It has low flammability and possesses good electrical properties even at temperatures up to 375°F. It is available in transparent and opaque grades. This resin is often used in electrical and food processing items or chemicals where resistance to acids and alkalis is critical.

Processing Considerations:

  • Residence Time: Residence time is 2 to 4 minutes.
  • Back Pressure: Keep back pressure at 150 PSI (or 1500 plastic pressure) or less.
  • Drying: PSU resin must be dried.
  • RPM: RPM is 30 – 125.

Screw Design Based on:

  • Medium Compression Ratio
  • Medium Transition Length
  • Medium Meter Channel Depth

Other Information:

  • Mixer: A low shear mixing screw can be used to run PSU. Reiloy Westland Corporation’s Eagle mixer has been proven to successfully process this resin.
  • Barrier: Barrier screws are not recommended.
  • Custom Design: A general purpose screw design will process this resin.
  • Recommended Valve: A three piece free-flow or three piece locking valve is recommended.
  • Screw & Barrel Material Recommendation: PSU processes very hot and chrome-plated components are not recommended.
  • Similar to Resin: The process is very similar to PES.

Various additives and/or fillers can have an effect on a resin’s process behavior. For more detailed information, please contact Reiloy Westland Corporation.

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Industry Applications - Resins

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